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*Moored Vessel

Purpose

To define a moored vessel and its associated properties.

Theory

Refer to Moored Vessel for further information on this feature.

Keyword Format

A block of eight lines defining the vessel parameters with the format:

TYPE=MASS

Myy, Iθθ, Mayy, Mazz, Maθθ, Mazθ,

TYPE=GEOM

AL, AT, Lfore, Laft, T, B

TYPE=DAMP

Byy, Bzz, Bθθ

TYPE=COG

Node (Number or Label) [, θG]

where:

Myy        =        the mass of the vessel

Iθθ        =        the vessel moment of inertia in yaw

Mayy        =        the vessel added mass in surge

Mazz        =        the vessel added mass in sway

Maθθ        =        the vessel added mass in yaw

Mazθ        =        the vessel added mass in sway-yaw coupling

AL        =        the longitudinal area of the vessel exposed to wind action.

AT        =        the transverse area of the vessel exposed to wind action.

Lfore        =        the length from the vessel centre of gravity to the forward perpendicular

Laft        =        the length from the vessel centre of gravity to the aft perpendicular

T                =        the vessel draft.

B                =        the vessel beam.

Byy        =        the linear damping coefficient in surge

Bzz        =        the linear damping coefficient in sway

Bθθ        =        the linear damping coefficient in yaw

Node        =        the node (number or label) located at the vessel COG

θG        =        the heading of the undisplaced vessel (in degrees), measured anticlockwise from the global Y-axis

This keyword is only relevant to mooring analyses. The order in which the TYPE=statements appear is not significant, as long as the relevant data is given under each TYPE=statement. The parameters relating to vessel mass and inertia should be calculated with reference to the vessel centre of gravity. Only one moored vessel may be specified in a mooring analysis and all TYPE=VESSEL boundary conditions and subsequent *RAO data should refer to that vessel. If you specify a node label rather than a node number, it must be enclosed in {} brackets.

mass

Purpose

To input data defining the inertia of a moored vessel.

Table Input

geometry

Purpose

To input data defining the geometry of a moored vessel.

Table Input

damping

Purpose

To define linear damping coefficients for a moored vessel.

Table Input

location

Purpose

To define the location of the vessel centre of gravity and the undisplaced vessel heading.

Table Input